package Net::HTTP::NB; # $Id: NB.pm,v 1.5 2001/08/28 03:03:42 gisle Exp $ use strict; use vars qw($VERSION @ISA); $VERSION = "0.02"; require Net::HTTP; @ISA=qw(Net::HTTP); sub sysread { my $self = $_[0]; if (${*$self}{'httpnb_read_count'}++) { ${*$self}{'http_buf'} = ${*$self}{'httpnb_save'}; die "Multi-read\n"; } my $buf; my $offset = $_[3] || 0; my $n = sysread($self, $_[1], $_[2], $offset); ${*$self}{'httpnb_save'} .= substr($_[1], $offset); return $n; } sub read_response_headers { my $self = shift; ${*$self}{'httpnb_read_count'} = 0; ${*$self}{'httpnb_save'} = ${*$self}{'http_buf'}; my @h = eval { $self->SUPER::read_response_headers(@_) }; if ($@) { return if $@ eq "Multi-read\n"; die; } return @h; } sub read_entity_body { my $self = shift; ${*$self}{'httpnb_read_count'} = 0; ${*$self}{'httpnb_save'} = ${*$self}{'http_buf'}; # XXX I'm not so sure this does the correct thing in case of # transfer-encoding tranforms my $n = eval { $self->SUPER::read_entity_body(@_); }; if ($@) { $_[0] = ""; return -1; } return $n; } 1; __END__ =head1 NAME Net::HTTP::NB - Non-blocking HTTP client =head1 SYNOPSIS use Net::HTTP::NB; my $s = Net::HTTP::NB->new(Host => "www.perl.com) || die $@; $s->write_request(GET => "/"); use IO::Select; my $sel = IO::Select->new($s); READ_HEADER: { die "Header timeout" unless $sel->can_read(10); my($code, $mess, %h) = $s->read_response_headers; redo READ_HEADER unless $code; } while (1) { die "Body timeout" unless $sel->can_read(10); my $buf; my $n = $s->read_entity_body($buf, 1024); last unless $n; print $buf; } =head1 DESCRIPTION Same interface as C but it will never try multiple reads when the read_response_headers() or read_entity_body() methods are invoked. This make it possible to multiplex multiple Net::HTTP::NB using select without risk blocking. If read_response_headers() did not see enough data to complete the headers an empty list is returned. If read_entity_body() did not see new entity data in its read the value -1 is returned. =head1 SEE ALSO L =head1 COPYRIGHT Copyright 2001 Gisle Aas. This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself. =cut